Pressure-gage.



J. SHEBOL & W. F. ALBRECHT.

PRESSURE GAGE.

APPLIGATION FILED PEB.18, 191s.

Patented Feb. 2, 1915.

county of Onondaga,

PRESSURE-GAGE.

Specification of Letters Patent.

Patented Feb. 2, 1915..

Application filed February 18, 1913. Serial No. 749,091.

To all whom it may concern Be it known that we, JosEPH 5311151201. andWILLIAM F. ALBRECHT, of Syracuse, in the in the State of New York, haveinvented new and useful Improvements in Pressure-Gages, of which thefollowing, taken in connection with the accompanying drawings, exactdescription.

This invention relates to certain improvements in pressure gages of theclass set forth in our Patent No. 1,002,877, September 12, 1911, andalso in our pending application N 0. 739,460, filed December 31, 1912,except that, in the present application, the object is to establishfrictional connection between the index fingerand its locking support topermit said finger to be separately adjusted for proper reading of apredetermined pressure and also to permit the instrument to be easilyand quickly calibrated to varying pressures. In other words, we havesought to provide for two adjustments, one of which I is adapted toadjust the rocking member pressures of automobiles independently of ortogether with the index finger, and the other to permit the index fingerto be adjusted independently of its rocking support or Bourdon tube towhich the rocking member is linked. These'gages are used largely forindicating tire and other and is frequently screwed in an opening in thedash directly inv front of the seat.

Another object of the invention is to provide the case with an axiallyadjustable flange frictionally thereof and adapted to be secured to-thedash by screws or other fastening means at different points between theends of the case according to the thickness of the dash or degree ofrojection which it may be desired to obtain or the front of theindicator.

A further object is to provide the case with a telescoping cover held inplace by a bayonet lock and a serrated edge of one side of the angularslot forming a part of the bayonet lock, thus increasing a frictionallock between the main body of the case and cover for more positivelyholding the cover in operative position and, at the same time,permitting it to be removed when necessary to adjust the indicatingmechanism.-

Other objects anduses will be brought out in the following description.

In the drawings-Figure 1 is a front face view of a pressure gageembodying the variis a full, clear, and

fitted upon the periphery ous features of our invention. Fig. 2 isa faceview of the same gage with the dial and cover removed to show theinterior mechanism. Fig. 3 is a transverse vertical sectional view ofthe same on line 33, Fig. 1. Fig. 4 1s an enlarged vertical sectionalview through the lower front portion of the main body of the case takenon line M, Fig. 2, showing more particularly the locking member and hubIn carrying out the objects stated, we pro-- 'vide a T-shape post I withan inlet passage -2- communicating with one end of a Bourdon tube .3which is secured to one side of the post and extends around and. to theopposite side thereof so that its opposite end is free to expand andcontract under pressure of the fluid which may enter the same.

The post is preferably disposed in a horizontal dposition so that'itshead is vertical, one en of the inlet opens through the bot tom of theouter end of the stem while the opposite end opens through the side ofthe head into the adjacent end of the hollow tube 3, the communicatingpassage be? tweenthe inlet 2 and the tube 3- being indicated at 1;,.Fig.3. A stud or screw 5 is screwed or otherwise secured into the front sideof the head of the post -1- and projects forwardly some distancetherefrom and terminates in a head 5'. Upon this stud or post isjournaled a hub '6- of a rocking member 7-, the .two parts being firmlysecured together by a wedging fit or by other suitable fastening meansso that they will rotate together upon the stud 5.

The main body of the rocking member -7- is provided with a later-allyprojecting curved arm 8 extending partially around and some distancefrom the hub 6-, and having its free end bendable toward and from saidhub or axis of the rock post together thetube. Fig. '7 is a pressuregage taken ing member for rotary adjustment of the index finger in amanner presently described. The free end-of the bendable arm ispivotally connected to one end of a link 9 having its opposite endpivotally connected to the free end of the tube -3- as shown moreclearly in Figs. 2 and 6. The tube 3 is circular and resilient and istensioned to normally hold the rocking member -7 in a predeterminedposition when not under pressure.

The periphery of rocking member is preferably tapered toward its frontend for receiving an internally tapered hub -10- of an index finger -1l.The hub of the index finger is, therefore, slidable telescopically uponthe hub -6 of the rocking member to establish frictional lockingengagement therewith, thus permitting the index finger to be adjustedrotarily upon and relatively to the rocking member to facilitatecalibration of the dial and also to enable the index finger to registerwith the number of graduations' on a dial -12 corresponding with apredetermined pressure.

The head of the post -1 together with the Bourdon tube andpressure-indicating mechanism is housed within a sheet metal case 13having a suitable cover --1-t telescoping therewith, the main body ofthe case being preferably cylindrical and stamped from a single piece ofsheet metal while the cover is provided with a transparent or glassfront plate -'15- and a metal annular flange l6- made so as to hold theglass plate in operative position against the front edge of the mainbody of the case when the parts are assembled as shown in Fig. 3.' Thedial l2 is also circular and tightly fitted within the front portion ofthe ,case where it is secured to the post by a suitable fastening memberor bracket -17 thereby dividing the interior of the case into front andrear compartments -l8 and 19-.

The Bourdon tube together with the head of the post 1 and greaterportion of the rocking member 7 are mounted within the compartment l9,the back of the case being provided with an opening '-20- through whichthe stem of the post -lis adapted to-extend for connection with thesource of fluid pressure, not shown.

The front compartment 18-' between the dial 12- and glass plate -15-receives the index finger 1l and is con-- nected to the rocking member-7- through an opening -21 in a dial close to the bottom of the case.The head of the post -1-' is secured to the inner face of the back ofthe case by suitable fastening means, as screws -22, Fig. 3.

As previously intimated the main body of the case is cylindrical andpreferably of the hub 6 of the uniform diameter from end to end and uponthe periphery of this cylindrical portion is Another distinct-feature ofour invention is that the case and cover are held in operative relationby a bayonet lock consisting in this instance of an-angular slot 25 inone side of the main body of the case and opening through the front edgethereof as shown more clearly in Fig.5, the arm or flange 16- of thecover being provided with an indentation forming a projection 26 which,when the cover is in proper position registers with the open end of theslot 25 and'by turning the cover rotarily the projection -26- will beshifted into the lateral branch of the slot. This branch or offsetportion of the slot is disposed at an angle with the plane of the frontface of the case so as to incline fromthe open end of the slot towardthe back of the case, the outer edge of the slot being provided with aseries of serrations 27- with which the projection 26 is adapted tofriction-ally interlock to holdv the cover more firmly againstaccidental turning and at the same timev permitting it to be turned whennecescary to remove the cover from the main body of the case.

The telescoping hub portions of the rocking member 7- and index fin er-11- are disposed between the ends 0 the tube 3 in the lower portion ofthe case so as to allow the use of a comparatively long index fingerwhich is movable around a concentric graduated portion of the dial 12 asshown more clearly in Fig. 1.

VVhatwe claim is:

1. In a fluid pressure gage, a circular spring tubefixed at its inletend, 'a relatively fixed pivotal stud parallel with the axis of the tubenear the fixed end thereof, a rock arm having an externally tapered hubjournaled on the stud, said rock arm being bent about the axis of thestud and having its free end some distance from its point of attachmentto the hub and bendable toward and from said hub to vary the throw of anindex finger, a link connecting the free end of the bendable arm withthe free end of the tube, and an index finger having an externallytapered hub fitted upon the first named hub to turn with said arm and tobe turned independently thereof by hand.

2. In a fluid pressure gage, a circular case, a fluid inlet conduithaving a portion thereof secured within the case and another portionthereof protruding through one side thereof, a circular spring tubesecured to one side of the conduit within the case and returning to theopposite side thereof, a pivotal stud secured to the conduit within thecase, a dial Within the case having an able toward and from said hub, alink conof. the arm with the free end of the tube, and an index fingerhaving an externally tapered hub projecting through the opening in thedial and fitted upon the tapered portion of the first necting the freeend In witness whereof we have hereunto set 25 our hands this 14th dayof February 1913.

' JOSEPH SHEBOL. W. F. ALBRECHT.

- Witnesses:

H. E. CHASE, EVA E. GREENLEAr.

